An ADU builder in Oakland is a licensed contractor who designs and constructs accessory dwelling units — detached backyard units, garage conversions, attached additions, and junior ADUs (JADUs). Because an ADU is a complete second dwelling, the builder coordinates foundation, framing, plumbing, electrical, and HVAC work and pulls it through Oakland's permit process and utility connections. Not every general contractor has built one, so the right builder is one with ADU-specific experience in California.
What ADU Builders Cost in Oakland [1][2]
Based on our Oakland cost data, expect the following ranges from local ADU builders. Quotes for the same scope typically vary 20-40% between contractors, so getting at least three bids is the single best way to control cost.
| New Detached ADU (all-in) | $160,000-$380,000 |
| Cost per Sq Ft | $250-$420 |
| Garage Conversion | $90,000-$200,000 |
| Prefab / Modular ADU (installed) | $120,000-$280,000 |
| City Permit & Plan Review | Published Oakland figures, not a guess. PLANNING/ZONING PERMIT (Design Review Exemption - Secondary Units/ADU), FY2025-26 grand totals including the 7.2% General Plan Update and 12.70% Technology/Records surcharges: Category I, II & III $593.95 (base report fee $491.62); Category IV $892.54 (base $738.77); Amnesty Program $1,779.79 (base $1,473.16). PERMIT APPLICATION INTAKE: $201.49 at the counter, $112.83 online. BUILDING PERMIT (Master Fee Schedule effective 8/28/2025, R3 residential): new construction $10.60 per $1,000 of construction valuation for plan review plus $8.00 per $1,000 for inspection (each with a $335.81 minimum); repairs/additions/alterations $17.08 plus $26.11 per $1,000. The City's own summary guidance is 'Building Permit Fees: Usually 4-6% of project value.' Plus a 12.70% Records Management & Technology Enhancement fee on all Building Services fees. ZONING INSPECTION for a building permit up to $200,000 valuation: $537.29. NEW SEWER LATERAL CONNECTION (the schedule expressly includes ADUs): $1,867.40. OUSD SCHOOL FEE collected by Planning & Building on the district's behalf: $5.17 per sq ft residential. Note: the widely circulated City 'Secondary Units' handout quoting a $464.89 planning permit fee and 5-6 week building permits was last updated 10/10/2019 and is obsolete - do not cite it. |
| Impact Fees | NONE, at any size. Oakland exempts Accessory Dwelling Units outright from all three of its residential impact fees - the Affordable Housing Impact Fee (OMC Ch. 15.72), the Transportation Impact Fee and the Capital Improvements Impact Fee (OMC Ch. 15.74) - as amended by City Council on 7/15/2025. The exemption is by project type with no square-footage threshold, so it is more generous than the state's 750 sq ft floor. For scale, what an ADU would otherwise avoid: single-family Affordable Housing Impact Fee runs $4.40-$12.66/sq ft depending on fee zone, plus Capital Improvements $0.74-$2.94/sq ft and Transportation $0.74/sq ft. SEPARATE and NOT exempted by these chapters: the OUSD school facilities fee ($5.17/sq ft residential), which Oakland's Planning & Building Department collects on the school district's behalf - homeowners should confirm ADU applicability directly with OUSD Facilities (510-879-2700). Utility connection fees and capacity charges (EBMUD, sewer lateral) are also outside the impact-fee exemption. |
For a full line-item breakdown, see our Oakland ADU cost guide. To confirm what you're allowed to build before you hire, review the Oakland ADU rules (max detached size: 850 sq ft for a studio or 1-bedroom; 1,000 sq ft for 2 bedrooms or more (detached Category 2 ADU). The 1,200 sq ft figure does NOT apply to detached units - it is only the cap on the 50%-of-primary-dwelling option for ATTACHED ADUs and on Category 1 conversions. Our current value overstates the detached allowance by 200-350 sq ft.; owner-occupancy: Not required for any ADU (Category 1 or Category 2), on single-family or multifamily lots. For a JADU, Oakland's current application checklist requires owner occupancy of either the JADU or the primary residence ONLY where the JADU shares sanitation facilities with the primary residence, citing Gov. Code s.66333(b); it is expressly N/A if the JADU has its own independent bathroom, or if the owner is a governmental agency, land trust, or housing organization. A notarized JADU deed restriction must be recorded before building permit issuance. CAVEAT: the Planning Code table itself (Table 17.103.01) still states the JADU owner-occupancy requirement flatly, with only the government/land-trust/nonprofit exception in Note 8; the 7/21/2026 checklist is the operative narrower application.).
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How to Vet an ADU Builder in Oakland
- License: Confirm a current contractor's license in California and that it's in good standing. Ask for the license number and verify it with the state board.
- ADU-specific experience: Ask how many ADUs they've completed in or near Oakland and request addresses or photos. ADU permitting and setbacks differ from a kitchen remodel.
- Portfolio & references: Get references from recent ADU clients and, if possible, visit a finished unit.
- Insurance: Verify general liability and workers' compensation coverage. Ask for a certificate of insurance.
- Written, detailed bid: Insist on an itemized, fixed-price or clearly-scoped bid — not a verbal estimate. It should state whether permits (Published Oakland figures, not a guess. PLANNING/ZONING PERMIT (Design Review Exemption - Secondary Units/ADU), FY2025-26 grand totals including the 7.2% General Plan Update and 12.70% Technology/Records surcharges: Category I, II & III $593.95 (base report fee $491.62); Category IV $892.54 (base $738.77); Amnesty Program $1,779.79 (base $1,473.16). PERMIT APPLICATION INTAKE: $201.49 at the counter, $112.83 online. BUILDING PERMIT (Master Fee Schedule effective 8/28/2025, R3 residential): new construction $10.60 per $1,000 of construction valuation for plan review plus $8.00 per $1,000 for inspection (each with a $335.81 minimum); repairs/additions/alterations $17.08 plus $26.11 per $1,000. The City's own summary guidance is 'Building Permit Fees: Usually 4-6% of project value.' Plus a 12.70% Records Management & Technology Enhancement fee on all Building Services fees. ZONING INSPECTION for a building permit up to $200,000 valuation: $537.29. NEW SEWER LATERAL CONNECTION (the schedule expressly includes ADUs): $1,867.40. OUSD SCHOOL FEE collected by Planning & Building on the district's behalf: $5.17 per sq ft residential. Note: the widely circulated City 'Secondary Units' handout quoting a $464.89 planning permit fee and 5-6 week building permits was last updated 10/10/2019 and is obsolete - do not cite it.), plan check (Standard review; backlog can delay), and impact fees (NONE, at any size. Oakland exempts Accessory Dwelling Units outright from all three of its residential impact fees - the Affordable Housing Impact Fee (OMC Ch. 15.72), the Transportation Impact Fee and the Capital Improvements Impact Fee (OMC Ch. 15.74) - as amended by City Council on 7/15/2025. The exemption is by project type with no square-footage threshold, so it is more generous than the state's 750 sq ft floor. For scale, what an ADU would otherwise avoid: single-family Affordable Housing Impact Fee runs $4.40-$12.66/sq ft depending on fee zone, plus Capital Improvements $0.74-$2.94/sq ft and Transportation $0.74/sq ft. SEPARATE and NOT exempted by these chapters: the OUSD school facilities fee ($5.17/sq ft residential), which Oakland's Planning & Building Department collects on the school district's behalf - homeowners should confirm ADU applicability directly with OUSD Facilities (510-879-2700). Utility connection fees and capacity charges (EBMUD, sewer lateral) are also outside the impact-fee exemption.) are included.
- Permit handling: Confirm they manage Oakland's permit process ("Ministerial (by-right), in two sequential permits filed through Oakland's Online Permit Center: (1) Zoning/Planning permit - an ADU Design Review Exemption, submitted with the ADU Zoning Criteria Checklist, Zoning Plan Requirements and (if an agent is applying) an Owner & Applicant Authorization Form; then (2) Building permit, plus a recycling/C&D plan and utility work (EBMUD, PG&E). Approval is ministerial when the application complies with 17.103.080 and Chapter 17.88, unless the proposal separately requires discretionary review - in which case the ADU review clock is extended to match the discretionary permit. Extra steps apply on California Register historic properties and in the S-9 zone. ADUs may only be rented for terms longer than 30 consecutive days, and a Business License is required to rent one.", typically Oakland publishes its own turnaround targets (business days, complete applications): ADU zoning/planning review 10 to 20 days; building plan check 21 days for a new ADU, or 10 days if you use a City of Oakland pre-approved plan; building final check a further 10 days to 3 weeks. Requesting expedited overtime plan review cuts those estimates by roughly 50%. The '60 days' currently on our page is the State ministerial deadline, not an Oakland-published figure - it should be labelled as such rather than presented as the city's timeline.) and who is responsible if revisions are required.
- Payment schedule: Avoid large upfront payments. A reasonable schedule ties payments to completed milestones.
Questions to Ask Before You Hire
- How many ADUs have you built in Oakland in the last two years?
- Is your bid fixed-price, and what would trigger a change order?
- Are permits, plan check, and utility connection fees included?
- What's a realistic timeline, including permit review (Oakland publishes its own turnaround targets (business days, complete applications): ADU zoning/planning review 10 to 20 days; building plan check 21 days for a new ADU, or 10 days if you use a City of Oakland pre-approved plan; building final check a further 10 days to 3 weeks. Requesting expedited overtime plan review cuts those estimates by roughly 50%. The '60 days' currently on our page is the State ministerial deadline, not an Oakland-published figure - it should be labelled as such rather than presented as the city's timeline.) and construction?
- Who is my point of contact and how are delays communicated?
- What warranty do you provide on workmanship?
- Can you share three recent California ADU client references?
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How much do ADU builders charge in Oakland?
ADU builders in Oakland typically quote $160,000-$380,000 for a new detached unit, or about $250-$420 per square foot, including design, permitting, and construction. A garage conversion runs $90,000-$200,000 and a prefab/modular ADU averages $120,000-$280,000. Add city permit and plan-review fees (Published Oakland figures, not a guess. PLANNING/ZONING PERMIT (Design Review Exemption - Secondary Units/ADU), FY2025-26 grand totals including the 7.2% General Plan Update and 12.70% Technology/Records surcharges: Category I, II & III $593.95 (base report fee $491.62); Category IV $892.54 (base $738.77); Amnesty Program $1,779.79 (base $1,473.16). PERMIT APPLICATION INTAKE: $201.49 at the counter, $112.83 online. BUILDING PERMIT (Master Fee Schedule effective 8/28/2025, R3 residential): new construction $10.60 per $1,000 of construction valuation for plan review plus $8.00 per $1,000 for inspection (each with a $335.81 minimum); repairs/additions/alterations $17.08 plus $26.11 per $1,000. The City's own summary guidance is 'Building Permit Fees: Usually 4-6% of project value.' Plus a 12.70% Records Management & Technology Enhancement fee on all Building Services fees. ZONING INSPECTION for a building permit up to $200,000 valuation: $537.29. NEW SEWER LATERAL CONNECTION (the schedule expressly includes ADUs): $1,867.40. OUSD SCHOOL FEE collected by Planning & Building on the district's behalf: $5.17 per sq ft residential. Note: the widely circulated City 'Secondary Units' handout quoting a $464.89 planning permit fee and 5-6 week building permits was last updated 10/10/2019 and is obsolete - do not cite it.) plus impact fees of NONE, at any size. Oakland exempts Accessory Dwelling Units outright from all three of its residential impact fees - the Affordable Housing Impact Fee (OMC Ch. 15.72), the Transportation Impact Fee and the Capital Improvements Impact Fee (OMC Ch. 15.74) - as amended by City Council on 7/15/2025. The exemption is by project type with no square-footage threshold, so it is more generous than the state's 750 sq ft floor. For scale, what an ADU would otherwise avoid: single-family Affordable Housing Impact Fee runs $4.40-$12.66/sq ft depending on fee zone, plus Capital Improvements $0.74-$2.94/sq ft and Transportation $0.74/sq ft. SEPARATE and NOT exempted by these chapters: the OUSD school facilities fee ($5.17/sq ft residential), which Oakland's Planning & Building Department collects on the school district's behalf - homeowners should confirm ADU applicability directly with OUSD Facilities (510-879-2700). Utility connection fees and capacity charges (EBMUD, sewer lateral) are also outside the impact-fee exemption.. Quotes for the same scope commonly vary 20-40% between builders, so collect at least three bids.
How do I find a good ADU builder in Oakland?
Look for a licensed contractor with completed ADU projects in Oakland specifically — ADUs involve local zoning, setback rules, and utility connections that general remodelers may not have handled. Verify the license, ask for an ADU-specific portfolio and references, confirm they carry liability and workers' comp insurance, and get a written fixed-price or detailed bid. Submit a request below and we'll forward it to local ADU builders serving Oakland for free quotes.
Do ADU builders in Oakland handle permits?
Most full-service ADU builders manage the permit process for you. In Oakland the approval process is "Ministerial (by-right), in two sequential permits filed through Oakland's Online Permit Center: (1) Zoning/Planning permit - an ADU Design Review Exemption, submitted with the ADU Zoning Criteria Checklist, Zoning Plan Requirements and (if an agent is applying) an Owner & Applicant Authorization Form; then (2) Building permit, plus a recycling/C&D plan and utility work (EBMUD, PG&E). Approval is ministerial when the application complies with 17.103.080 and Chapter 17.88, unless the proposal separately requires discretionary review - in which case the ADU review clock is extended to match the discretionary permit. Extra steps apply on California Register historic properties and in the S-9 zone. ADUs may only be rented for terms longer than 30 consecutive days, and a Business License is required to rent one." with a typical review timeline of Oakland publishes its own turnaround targets (business days, complete applications): ADU zoning/planning review 10 to 20 days; building plan check 21 days for a new ADU, or 10 days if you use a City of Oakland pre-approved plan; building final check a further 10 days to 3 weeks. Requesting expedited overtime plan review cuts those estimates by roughly 50%. The '60 days' currently on our page is the State ministerial deadline, not an Oakland-published figure - it should be labelled as such rather than presented as the city's timeline.. Confirm in writing whether permit fees, plan check (Standard review; backlog can delay), and impact fees are included in the bid or billed separately.
How long does it take to build an ADU in Oakland?
Plan for the permit review (Oakland publishes its own turnaround targets (business days, complete applications): ADU zoning/planning review 10 to 20 days; building plan check 21 days for a new ADU, or 10 days if you use a City of Oakland pre-approved plan; building final check a further 10 days to 3 weeks. Requesting expedited overtime plan review cuts those estimates by roughly 50%. The '60 days' currently on our page is the State ministerial deadline, not an Oakland-published figure - it should be labelled as such rather than presented as the city's timeline. in Oakland) plus construction. Most detached ADUs take 4-8 months of construction after permits are issued; garage conversions and prefab units are often faster. Ask each builder for a realistic schedule and what could delay it.
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